A dynamic prediction method for surface subsidence in solid filling mining

Abstract

The invention relates to a solid filling exploitation earth surface subsidence dynamic prediction method and belongs to an earth surface deformation prediction method in the mining technology. According to the solid filling exploitation earth surface subsidence dynamic prediction method, a time-varying subsidence model of a roof in solid filling exploitation is combined with a Knothe time function; a superposition principle is adopted to accumulate earth surface subsidence caused by filling body compressive deformation at different moments; and a solid filling exploitation earth surface dynamic prediction model is built. The solid filling exploitation earth surface subsidence dynamic prediction method is adopted, so that according to parameters such as the rock stratum time influence coefficient, filling body compressive deformation time influence coefficient, mining depth, mining thickness, coal bed pitch, prediction working face size and probability integral method prediction parameters, the time-varying dynamic deformation value of the solid filling exploitation earth surface subsidence can be predicted. The prediction method is simple and practicable, is low in cost, has wide practicability, and can provide a scientific basis for guiding solid filling exploitation design and reducing mining-induced damage.

Description

technical field [0001] The invention relates to a method for predicting surface deformation in mining technology, in particular to a method for dynamically predicting surface subsidence in solid filling mining. Background technique [0002] In recent years, with the increasing maturity of filling materials and filling technology, it has become possible to use filling mining technology to solve the problem of "three under" coal pressure, and it has become an effective way to control surface subsidence and improve the environment of mining areas. Solid fill mining is a fill coal mining method that integrates rock formation movement control and solid waste treatment. Because solid filling mining can effectively control surface subsidence, this coal mining technology is often used for pressing coal under important buildings, but such buildings are generally sensitive to surface deformation, and minor surface deformation may cause damage to buildings. have adverse social impacts...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, due to the large difference in rock movement mechanism between solid filling mining and caving mining, if the surface prediction model of caving mining is used to predict the surface subsidence of solid filling mining, the error of the predicted result is relatively large, and it cannot be completely satisfied. engineering needs

In addition, during the mining process, the mining damage changes with time. Although the dynamic deformation has a temporary effect on the building, it can also cause damage to the building, and even in some cases, the degree of damage caused by the dynamic moving deformation is greater than Greater than static movement deformation

Therefore, the model for predicting the static deformation of the surface in solid filling mining cannot meet the requirements for predicting the dynamic deformation of the surface

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